Basically, eStore plugins lets you make an online store with WordPress. You can put your blog and e-commerce store together.
WP eStore is a premium WordPress plugin with tons of features. Using this you can sell digital goods as well as physical goods. With WordPress eStore plugin, turn your existing or new WordPress site into a e-store and start selling your products or services.
Read more features of WordPress eStore
WordPress Simple PayPal Shopping Cart plugin
The WordPress Simple Paypal Shopping Cart is a very easy to use and lightweight WordPress plugin that allows you to sell products or services online in one click from your WordPress blog. This lets you add an ‘Add to Cart’ button anywhere on your blog.
Simple PayPal Shopping Cart
WooCommerce is a free eCommerce plugin that allows you to sell anything, beautifully. With the right plugin(WooCommerce plugin) and theme, you can convert WordPress into a fully-fledged digital shop.
So you have seen three good plugins to setup an online store. WooCommerce is the most popular among three and if you do research online, you can see that you will come across many eshops that have implemented WooCommerce. Should you decide to go with WooCommerce, it is strongly recommended to go with a reliable woocomerce hosting partner.